Mission: Yozakura Family

夜桜さんちの大作戦

Taiyo Asano lost his family in a crash, and his childhood friend Mutsumi Yozakura is the only person he still leans on. When her overprotective brother Kyoichiro targets him, Taiyo discovers the Yozakura household is a clan of spies bound by a single rule: no harming family. To stay alive and stay close to Mutsumi, he marries into the clan and starts training as a spy himself, learning the trade alongside her many siblings.